Process for obtaining barium-ortho-silicate or barium-tri-silicate by the decomposition of barium carbonate



Patented Sept. 22, 1931 FRITZ, Roman AND lmuvs m ma; 'RHENANIA-KU HEI VEREIN cnnmsonnn rnocnss FOR OBTAINING: nan rumgonii THE nncomros r olv o No Drawing. Application filed 1 Eay]2 7, 192?;"Se1ia1 No. :i1 9 4,8

The invention has referenceto a procession presence obtaining barlumorthosihcate or billlllnltll:

silicate and more particularly to-an improvement of the known process consisting inxburn mg a mixture of barlumcarbonate together} with silica or 'bariununetasilicatelata temperature of 1400-1500 Centigrade found that it is possible to lower the temperature at whichsaid'reaction takesfplace,v by

I carrying out the heating processin the pres ence of steam. l In this manner it is possible 1 Theobject of thisinvention'is to improve 2 this method in order to decreasethe.tempera ture required forthis reaction. We have to lower the temperature to abOutlOOOllOOf Centigrade.

The process may belcarriedout in a revolve ing tube furnacegandjit is ofspecialimpor; tance that the heating "gases; contain a suilicient quantity ofsteam tov act upon the mixture of barium carbonate and silicafcontain:

ing material during the burning operation. It is possible eitherto add'thesteam to the heating gases or to utilizefor heating theiu'rnace fuels which contain suflicicntquantities of hydrogenwhich is formed into steam, at

their combustion. Oil, producer gasfrom lignite, water gas or the like may be used for this purpose. i

The bariumorthosilicate or action and consequently anysul ur) compounds or sulphuric salts which may be formed during the: operation or .maybe conf tained in the bariumcarbon'ateaare expelled,

' so that the products obtained are free from sulphur] 7 The following examples show that the pres ence of steam has reallytheim'portant above explained.

(1) A mixture of 100 parts rium carbonateand 15.6 parts .of'fsan'd 'with' 98% of SiO are burntfor two hours in the bariumtrisili cate obtainedby this processmay betrans; ferred, for instance b'y'a treatment with water, into barium hydroxide, the restof BaO remaining bound tosilica in the form of baris um metasilica'te' It is of special advantage to utilize said" barium metasilicate-tolact upon the bariumcarbonate.

v In "this, 1nanner-the silica can be used for several times for the-r'e- 'A e on BERLIN e I evo ume of stea a ademp ra u e M1 009 1 -centigrade. gThe lossgef glowingiamounts to z ica w l ave ke P 56 Yha o 'e o nt 'of. Bat), that is 4 -Q he. We sh of, -theglovvingproduct must .go in oluti'on on I Y a imi, whereas; the: other. z altethe eo F emain aswbariummetasiliicateai d l oni nlypon atreatment withmydro chlori-cacidg On lixiviatingproduced obtained: 1

' m'a hen-3. gofrri ;aveight consists' of Ba() only, isoljub k y o -hlo 5 aci :the -bariu i w th?ar sii eioffsteam; @1100? en olgrade,

:(2) The same-im x re. renders,

.ofgwafcerisclnblegBaoz.and only after heating.

duringjtwohoursat 1450centigrade"38.2

4 A The'results'ofthese examples show'that of water soluble BaO' canYbe Obtained;

by heatingin' the presence of steam a com: plete'j transformation of barium carbonate I y int0 orthosilicateis possible at a relatively low E temperature. J Consequently the "de vantageythat' on the one hand they Want fofj' hand-the furnace liningflissaved. a It will be understood that when in, this specification andithe appended'claims we] I speak -of fsilica" containing material? We mean toinclude pure silica;

ters Patent ofthexUnited" States-is;.-

thosilicate or'bariumtrisilicate by the? decomposition of barium; carbonate compris i-ng "heating barium carbonate 'together- ,with I I jsilica' containing, material in the presence of 1 Steam; f p 1.. 1' a c. o' 2." The process .fo rff obtaining; barium or.-'

hating?wagiaai a v p p v v 25%, V at 1200?" Centigrade without the vpresenceof 1 stean'1'd1ifring",v two hours,- however,v only 21.8%

scribedrpro'ces's renders the considerable as; I

fuel is essentially lowered and'on the'other What I claim anddesire to secure 1 i 7 E2290 1.-,Theprocess for-obtaining -bariuinor-* thosilicatemr barium tri'silicate by the" def" composition of barium carbonate compris ing' heatingbarium carbonatetogether-with???" f barium metasilicate in the presence of steam.

3. The process for obtaining barium or thosilicate or barium trisilicate by the decomposition of barium carbonates compris- 5 ing heatingibarilmi 'carbonate2inthe*presence I of steam together with bafimn 'metasilicate which is Obtained from the bariumsilieate- 1 ioLmed-by neaetioniqf baninm carbonate .7 J

Y 10 Arne rbcssuar obtainingi'bafium' ark? tl qsilicatemr barium ztrisilicate by the mde a composition of bariumxcarbonate eompfisin'g i i I r heating barium cai'bonate together with silica containing materialain:thepresence of 15 steam at a relatively low temperature, 7

" 5 -''Theiprocessfoi" Obtaining b-arium bf- =-2si1ieacontaining materia'iin thejpresence of 'fs'team' at about-10004100 ceritigrade.

'6." The; process for Obtaining 1 barium yorthosilicate "or; barium tri'siliea'te the-(1e eompusition of barium' carbonate compris- .5 'ingfiheating bapium cai bonate tqgether 'with si'lica containing material in the presence "of steam by the aidof fuels rich in hydrqgen, whidhform vapour 1 at their 'com'bustion.

51 7. -'The'pr0'eess for dbtainingvbarium 01 1 *"thosilicate Or bafiuin trisilicate "by the Heeompo'sitiqn 'ofibarium cafibonate comprising heating barium'carb onate to'getlnar with siliea containing-ImateniaL- heating gases hay- *ing 15% by *v61uine :uf ste'am being present 3 during the' heatingbperation to act uppnz the imixture'. e

-- I FRITZRQTHIE 

